co⚡e: Sparkplug™ MQTT edge

All new testrig setup for unittest of coBolt using TEST_ORDERED() functionality.

New setup for unittest, integrationtest and user pov test for co⚡e - Sparkplug™ MQTT edge and host
Reorganised project into at least 3 folders:
* unittest
* integrationtest
* user pov test.

Skeleton template demonstrated in unittest == Stable and ready
Added tests for FB_WStringBuilder

in lieu with cfUnit v1.2